Pen



FIG. 1 is a front elevational view of a pen according to my new design.

FIG. 2 is a rear elevational view thereof.

FIG. 3 is a left side elevational view thereof.

FIG. 4 is a right side elevational view thereof.

FIG. 5 is a top plan view thereof.

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof.

The broken lines in the drawing of FIG. 6 are included for the purpose of showing features that form no part of the claimed design. 

CLAIM The ornamental design for the pen, as shown. 